Reducing-valve.



N0. 7.61.106. PATBN-TED MAY 31, 1904.

A. ROTH.

REDUCING VALVE.

APPLICATION FILED SEPT. 18, 1903.

THE NORRIS PETERS co. PHOTO UNITED STATES Patented May 31, 1904.

PATENT ()FFICE.

REDUCING-VALVE.

SPEGIFIGATION forn1ing part of Letters Patent No. 761,106, dated May 31, I904. Application filed September is, 1903. Serial No. 173,679. (No model);

To all whom it may concern.-

Beit known that I, ALBERT ROTH, a subject of the German Emperor, residingat 44 Beyerstrasse, Grimmitschau, Saxony, Germany, have invented certain new and useful Improvementsin Reducing-Valves; and I do hereby declarethe following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a reducing-valve by means of which the steam taken from a high-pressure steam-pipe can be reduced to the lowest conceivablepoint of pressure, The intended purpose is mainly effected by placing the low-pressure side of the apparatus incommunication with an expansion-body such-as is already employed in many forms in connection with devices for reducing steam-pressure, so that only when a certain pressure is reached in the low-pressure chamber is it. possible for the steam to reach the expansion-body, which then in the usual manner in consequence of its expansion causes the steam-inlet valve to close.

The possibility above mentioned of a flow of steam to the expansion-body when a certain internal pressure is produced in the low-pressure side of the apparatus is insured by the introduction between the low-pressure side and the expansion-body of a resistance which the steam must overcome. This resistance may be in the form of a valve of the safetyvalve type loaded with a spring, a weight, or a lever.

In the accompanying drawings that form of the invention is illustrated in which a springloaded safety-valve is introduced as a resistance.

Figure 1 is a general view of the steamvalve'-spindle,- The short armof the anglelever d, lies against the end of an expansionbody is, the interior of which is in communi- J cation with the low-pressure side of the valvechamber throughthe circulation-pipe and the resistance-valve arranged on the valvecham- Qber. The'valve-conef of the resistance-valve is loaded with a spring, so that it is only when a certain pressure prevails on thelow-pressure side that the cone is raised and the passage for "the steam to the expansion-body it thus opened. The load on the cone f in the resistance-valve is varied or adjusted by turning the handle h,

which raises or lowers a screwtheaded guidesleeve, and thus places the spring under a higher or lower degree of tension.

In the drawings the expansion body is shown as a pipe which is heated from within. In orderthat the sides of the pipe may be quickly heated with as little steam as possible, a body 9 which is a bad conductor of heat is arranged in the tube, leaving but a very small internal space. apparatus it is immaterial so far as concerns the expansion-body whether the inner or the outer surface of such body be placed in communication with the low-pressure side of the valve-body or whether the expansion-body be made solid or in the form of a pipe or whether the solid body be replaced by a body filled with a suitable fluid, in which case the expansive capacity of the particular fluid would form the actuating moment.

The action of the apparatus is as follows: If, for example, a low-pressure steam-heating device be supplied with steam, the high-pressure steam through its own pressureand the velocity at which it flows in will keep the valve '0 open until the expansion-body k is heated. This heating is effected in the following manner: When the pipe to be furnished with steam has been duly filled, the pressure of steam will rise gradually on the low-pressure side until it has reached the point at which the cone of the resistance-valve is raised. In consequence of this opening of the resistancevalve a passage is opened for the steam to the circulation-pipe p, which conveys the steam to the expansion-body, whereby this body is heated. Being thus heated, the expansion- As regards the action of the I body expands in the'direction of its length and presses the angle-lever (Z against the movable valve-spindle a, which is moved inward that is, in the direction of the valve-seat. The expansion of the body 7:3 is regulated in relation tothe angle-lever (Z, so that by the expansion of the body A: the valve-spindle (4 is forced toward its valve-seat, and thereby the steam coming from the high-pressure pipe throttled and, if necessary, entirely out oif. Hereby the steam-pressure in the low-pressure side of the apparatus is so far reduced that the resistance-valve no longer allows steam to reach the expansion-body 7c, and the expansion-body cools again and contracts. In consequence of this the angle-lever allows the valve-spindle play for the opening of the valve, so that. hi gh-pressure steam can flow afresh chamber with inletand outlet openings, a valve 7 into the low-pressure heating device.

The lever-connection between the expansion-body Z: and the valve-spindle a maybe 7 replaced by tooth-wheel gearing and the ob-- ject even be effected without either by the employment of a corresponding longand correspondingly-suitable expansion-body directly connected with the spindle or actually forming the spindle.

WhatI claim, and desire to secure by Letters Patent, is. v

1. A reducing-valve comprising avalvefor adjusting said resistance, to varying presadmitted to it from the low-pressure compart- 3 ment and adapted to force the reducing-valve toward its seat, a conduit arranged to convey the steam to the expansion-body, and a resistance situated in the area of the low-pressure compartment and interposed between the conduit and said compartment so that the steam can only reach the expansion-body after a fixed pressure controlled by the resistance is reached in the low-pressure compartment.

2. A reducing-valve comprising a valvechamberwith inlet and outlet openings,a valve seated in the chamber and dividing it into high and low pressure compartments,an expansionbody capable of being expanded by the steam admitted to it from the low-pressure compart- 5 ment and adapted to force the reducing-valve toward its seat, a-conduit arrangedto'convey the steam to the expansion body, a resistance situated in the area of'the low-pressure compartment and interposed betweenthe conduit 5 andsaid compartment so that the steam can only reach the expansion-body after a fixed pressure controlled by the resistance is reached in the low-pressure compartment, and means sures, from outside the valve-chamber.

In testimony whereof I have aifixed my signature in presence of two witnessesi 7 ALBERT ROTH.

Witnesses: M. L. GREEVEY, C. A. OREE-VEYJ 

